We first showed you Bentley's 2013 Continental GT Speed Convertible (with a Barney-inspired paintjob) last week, but at that point, details surrounding the high-performance twin-turbocharged droptop were still unofficially leaking into the public domain. With the Detroit auto show coming ever closer, the men and women of Crewe have formally released a complete array of specs for the GT Speed Convertible.

As reported, the GT Speed Convertible will use the same powertrain as the GT Speed coupe, which means a 6.0-liter twin-turbo W-12 producing 616 hp and 590 lb-ft of torque (available from 2000 to 5000 rpm). Couple that with an eight-speed automatic transmission (no doubt beefed up to handle all that twist) and an all-wheel drive system with a 40/60 front/rear torque split, and you have a recipe for fierce acceleration. Bentley claims that the GT Speed Convertible makes the 0-60 mph run in 4.1 seconds and hits a top speed of 202. To put that in perspective, the GTC W12 does a 4.5-second 0-60 and hits a top speed of 195 mph, and the comparatively "cheap" and "slow" GTC V8 takes 4.7 seconds to hit 60 and maxes out at 187 mph.

How much will all this speed cost? It's not completely clear at this point, but we expect the Speed convertible to command the same premium as the Speed coupe – that is, $21,750 more than the stock Continental GT W12. Add the same amount to the Continental GTC W12's current MSRP of $218,525 and you'll arrive at a ballpark estimate of a cool $233,525 (all prices include $2725 destination and $3000 gas guzzler tax).

For that price Bentley promises bragging rights--it claims the GT Speed Convertible is the fastest four-seat convertible on sale--but the droptop gains a new, lower setting for the adaptive suspension, a small lip spoiler, some tweaks to the ECU and steering, and lashes of quilted leather and aluminum (both part of the Mulliner Driving Specification package, standard on the GT Speed Convertible). Then again, for customers looking for something to talk about at the country club and willing to dish out upwards of $200k for it, the 202-mph top speed alone is worth the extra cash.

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